my recent experience(post 13 above) suggest that ziplocks filled with only air does add more insulateing value then a vapor barrier alone.the two bags that went flat would have still served as vapor barriers yet i definatly felt a chill there.the areas of the two full ones i stayed warm.same bags, more air.
i am not saying air is as good as other insulation.but i wonder how big the differance really is.
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